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Production method for high conductivity bi-polar plates for acorn cell

A high-conductivity, bipolar plate technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of material mechanical properties decline, disintegration of long polymer chains, shortened service life, etc., to achieve easy operation, uniform mixing of raw materials, The effect of long service life

Active Publication Date: 2009-04-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the present invention proposes a method for preparing a high-conductivity bipolar (current collector) plate for a vanadium battery, which solves the problem that conventional high-temperature mixing can easily oxidize the resin, cause the disintegration of the long polymer chain, and then lead to the deterioration of the mechanical properties of the material. decline, reduction in service life, etc.

Method used

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  • Production method for high conductivity bi-polar plates for acorn cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Raw material quality ratio is as follows:

[0035] PE 30 (particle size range 50~80μm)

[0036] Conductive carbon black 70 (particle size range 20~50μm)

[0037] The total mass of the two was 100g, placed in 500ml of ethanol, stirred at 800 rpm, and stirred for 1h. Then it was filtered with suction for 1h, until no solvent dripped out (in the funnel). The suction-filtered mixture was dried at 70°C until the quality remained unchanged. Under 15MPa, hot pressing at 100℃~120℃.

[0038] The volume resistivity of the prepared conductive bipolar (current collector) plate is 0.5Ω.cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: Coulomb efficiency 90%, energy efficiency 63%, voltage efficiency 70%.

Embodiment 2

[0040] Raw material quality ratio is as follows:

[0041] PE 30 (particle size range 100~150μm)

[0042] Conductive carbon black 60 (particle size range 20~50μm)

[0043] Graphite powder 10 (particle size 200μm)

[0044] The total mass of the three is 100g, placed in ethanol and water (500ml), the volume ratio of ethanol and water in this example is 1:1, the stirring speed is 1000 rpm, and stirred for 1h. Then it was filtered with suction for 1h, until no solvent dripped out. The suction-filtered mixture was dried at 70°C until the quality remained unchanged. Under 15MPa, hot pressing at 110℃~130℃.

[0045] The volume resistivity of the prepared conductive bipolar (current collector) plate is 0.2Ω.cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: coulombic efficiency 93%, energy efficiency 74%, voltage efficiency 80%.

Embodiment 3

[0047] Raw material quality ratio is as follows:

[0048] PE 30 (particle size range 100~150μm)

[0049] Conductive carbon black 60 (particle size range 20~50μm)

[0050] Acetylene black 10 (particle size 20μm)

[0051] The total mass of the three is 100g, placed in 500ml of ethanol, stirred at 800 rpm, and stirred for 1h. Then it was filtered with suction for 1h, until no solvent dripped out. The suction-filtered mixture was dried at 70°C until the quality remained unchanged. Under 15MPa, hot pressing at 110℃~130℃.

[0052] The volume resistivity of the prepared conductive bipolar (current collector) plate is 0.5Ω.cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: Coulombic efficiency 92%, energy efficiency 70%, voltage efficiency 76%.

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Abstract

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method of a high conductivity bipolar plate (current collector) for a vanadium battery, and the preparation method can solve the problems that the high temperature mixing is easy to cause the resin oxidation, cause the disintegration of polymerized long chain and to further lead to the decrease of the mechanical performance of the material and the decrease of the service life, and the like. A conductive additive and polymer resin powder are taken as raw materials of conductive plastics, a volatile solvent is taken as a dispersion medium, the polymer resin and the conductive additive are fully mixed by stirring and then filtered, and the mixture is dried in an oven and then arranged in a mold for hot-press forming. The preparation method firstly mixes the conductive additive and the polymer resin powder in the dispersion medium evenly; the even mixture of the two is obtained after removing the medium, the heating and the mold pressing are directly carried out, thereby preparing the bipolar plate (current collector) of the vanadium battery. The process method is simple, the operation is easy, the material mixing is even, and the conductive plastic bipolar plate (current collector) with the resistivity of 0.2-0.5 omega.cm, thereby being in line with the using indicators of the vanadium battery.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to a method for preparing a high-conductivity bipolar (current collector) plate for a vanadium battery. Background technique [0002] Vanadium battery, the full name of vanadium ion redox flow battery, is a new type of green battery. Its energy is stored in the form of positive and negative electrolytes, and the positive and negative reactions are: [0003] Positive reaction: VO 2 + +2H + +e - →VO 2+ +H 2 O E 0 = 1.00V [0004] Negative reaction: V 3+ +e - →V 2+ E. 0 =-0.26V [0005] The positive and negative electrolytes are each driven by a pump, and reduction and oxidation reactions occur on the electrodes on both sides of the ion exchange membrane, respectively, to complete charge and discharge. The current for charging and discharging the battery is conducted by the bipolar (current collector) plate and finally collected. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/88
CPCY02E60/12Y02E60/50Y02E60/10
Inventor 刘建国门阅陈晖张海玉严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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